<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Pdf
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Rgb.php 18993 2009-11-15 17:09:16Z alexander $
 */


/** Internally used classes */
require_once 'Zend/Pdf/Element/Numeric.php';


/** Zend_Pdf_Color */
require_once 'Zend/Pdf/Color.php';

/**
 * RGB color implementation
 *
 * @category   Zend
 * @package    Zend_Pdf
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Pdf_Color_Rgb extends Zend_Pdf_Color
{
	/**
	 * Red level.
	 * 0.0 (zero concentration) - 1.0 (maximum concentration)
	 *
	 * @var Zend_Pdf_Element_Numeric
	 */
	private $_r;

	/**
	 * Green level.
	 * 0.0 (zero concentration) - 1.0 (maximum concentration)
	 *
	 * @var Zend_Pdf_Element_Numeric
	 */
	private $_g;

	/**
	 * Blue level.
	 * 0.0 (zero concentration) - 1.0 (maximum concentration)
	 *
	 * @var Zend_Pdf_Element_Numeric
	 */
	private $_b;


	/**
	 * Object constructor
	 *
	 * @param float $r
	 * @param float $g
	 * @param float $b
	 */
	public function __construct($r, $g, $b)
	{
		/** Clamp values to legal limits. */
		if ($r < 0) { $r = 0; }
		if ($r > 1) { $r = 1; }

		if ($g < 0) { $g = 0; }
		if ($g > 1) { $g = 1; }

		if ($b < 0) { $b = 0; }
		if ($b > 1) { $b = 1; }

		$this->_r = new Zend_Pdf_Element_Numeric($r);
		$this->_g = new Zend_Pdf_Element_Numeric($g);
		$this->_b = new Zend_Pdf_Element_Numeric($b);
	}

	/**
	 * Instructions, which can be directly inserted into content stream
	 * to switch color.
	 * Color set instructions differ for stroking and nonstroking operations.
	 *
	 * @param boolean $stroking
	 * @return string
	 */
	public function instructions($stroking)
	{
		return $this->_r->toString() . ' '
		. $this->_g->toString() . ' '
		. $this->_b->toString() .     ($stroking? " RG\n" : " rg\n");
	}

	/**
	 * Get color components (color space dependent)
	 *
	 * @return array
	 */
	public function getComponents()
	{
		return array($this->_r->value, $this->_g->value, $this->_b->value);
	}
}

